Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 855,453,000	$ 855,453,000
Goodwill impairment charges	$ 0	$ 0	$ 0
Estimated amortization expense succeeding period	5 years
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining life	8 years
Other Identifiable Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-average remaining life	12 years